PreSonus Notion 6 - Notation Software (Boxed) - Manual (Page 210)

11.29
Add Multiple Key Signatures
In traditional notation, a key signature affects all instruments at the same time .
But Notion also supports the use of multiple simultaneous keys .
Multiple keys.
Refer to the steps in the previous procedure as a guide as you:
1 . Open the Key Signature dialog box .
2 . At Tonic, specify one of the key signatures you want to use .
3 . Clear the Enter in all parts checkbox .
» The Concert key checkbox becomes available .
4 . Decide how you want to handle the key change on transposing instruments .
> If you want to force the exact key you specified on all instruments (including transposing instruments), ensure you
clear the Concert key checkbox .
> If you want to permit Notion to display on transposing instruments the correct key signature equivalent for the
key you want, ensure you
select the Concert key checkbox .
5 . Click the OK button .
» Your choice of key signature appears on the Music Cursor .
6 . Add this to only the staves you want to have this key .
7 . Repeat this procedure until you have assigned new keys to all the staves involved .